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Snaking it pulled nothing out, the standpipe is hidden in the wall, it has worked with no problems for the 13 years we've been in this house, why does running the hose on full blast not backup the standpipe but when I put the washing machine drain hose in it does?

Old washing machine, 2" drain pipe, I don't know if it connects to kitchen sink drain, this is the only drainage problem in the house.

When the washing machine goes to drain cycle the drain pipe is back flowing, I've snaked the drain, used a bladder, and even just ran the garden hose down it full blast and drains fine, yet when I put washing machine drain hose in the drain it immediately starts back flowing again, I'm baffled...